Unharmed is a synonym of scathless.
As adjectives the difference between unharmed and scathless
is that unharmed is which has not suffered harm; which has not been injured or damaged while scathless is (obsolete) without harm or damage.
unharmed
English
Adjective
(
en adjective)
which has not suffered harm; which has not been injured or damaged
Synonyms
* in one piece, safe and sound, unhurt, uninjured, unscathed
scathless
English
Adjective
(-)
(obsolete) without harm or damage
Synonyms
* unharmed
* scot-free